Apparatus for rolling out metal tubes.



O. WINDEGKER. APPARATUS F011 ROLLING OUT METAL TUBES.

APLIOATION FILED PEB. 26,1908.

Patented Nov. 12,1912.

by# fr W/ TNF-SSFS OTTO WINDEKER,v OF STRASSBURG-RUPRECHTSAN, GERMANY.

APPARATUS FOR ROLLING OUT METAL TUBES.

Specication of Letters Patent.

Patented Nov. 12, 1912.

Application led February 26, 1908. Ser'ial 170.417,983.

, To all whom 'it may concern:

Be it known that I, Oa'ro WINDECKER, a subject of the Emperor 'ofGermany, residi ing at 17aL Ritzengasse, Strassburg-Ruprechts'an,Germany, have invented` a new and useful Apparatus for Rolling Out MetalTubes, of which the following is a specification. y l

This invention relates to an apparatus for rolling out metal tubes bymeans of rollers, having concentric bosses thereon. i The ,inventionrelates to the features of construction and combination and arrangementof parts hereinafter described and particularly Apointed out in theclaim.

The invention is illustrated in the accompanying drawings in whichFigure 1 is a sectional view showing diagrammatically the .invent-ion,and Fig. 2 is a like view showing the position of the rollers.

As shown, the hollow billet from which the tube is formed is placed on amandrel 2 and placed between the conical rollers A+B.

These rollers are placed with their axles at an angle to each other' andto the direction of movement of the block andthe conical surface of eachroller is provided with circular concentric bosses having roundedsurfaces meeting each other in angles, and one roller has its last bossprovided with a flatA face a., extending beyond the last boss of theopposite roller. The rollers are so arranged that their bossesarestaggered in relation to each other. The rollersrotate in oppositedirections and their motion is imparted to the billet and the mandrel,by contact with the former causing the two to rotate simultaneously in aclockwise direction, and at the same time feeding them forward (asindicated by the arrow in Fig. 2), with a gradual longitudinaldisplacement. During the' rolling the bosses form upon the surface ofthe billet concave depressions b, and between each two depressions,elevations '0. These depressions cause the longitudinal 1 stretching ofthe material. The elevations c produced by the bosses of one roller thenencounter, after a-half turn of the tube, the

bosses of the other roller, so that-otherdepressions are formed wherethe elevations o were and these bosses penetrate deeper into thematerial. The new depressions and elevations are after another half-turn of the tube, encountered by the bosses of the first roller, and soforth. Each half turn of the tube, vthat is each new 'engagement of theperi hery of the tube with the bosses of one l of t e rollers, repeatsthe same operation as the previous one, and effects the displacement ofthe'tube in an axial direction. The flat boss afsmooths the surface ofthe tube as it leaves the rollers and the tube is widened so as to itloosely inthe mandrel, Whereb the mandrel may be removed withoutdiiiibulty. The boss Z of the roller must have a space X between itselfand the billet 'so as to permit small lateral movement of the billet.

Having now particularly described and ascertained the nat-ure of my.said invention and vin what manner the same is to be performed I declarewhat I claim is:

' A rolling r mill comprising rollers, each provided with circularconcentric bosses,

having rounded surfaces meeting each other in such manner as to'formangles at the points of their intersection. A

In witness whereof I have my hand in presence of two Witnesses.

" OTTO WINDECKER.

Witnesses:

CARL W. SCHMrr'r, l SIEGFRIED HAUSER.

hereunto set

